PROBLEM TO BE SOLVED: To improve determination accuracy for determining drowsiness.SOLUTION: The drowsiness determination device includes: an amplitude analysis part that, upon receiving a pulse wave signal of a subject, analyses the received pulse wave signal and calculates a pulse wave blood pressure modulation waveform representing modulation of a blood pressure from the amplitude of pulse waves a pulse wave analysis part that analyses the pulse waves and calculates a pulse blood pressure modulation waveform representing modulation of the blood pressure from a pulse interval of the pulse waves a frequency distribution creation part that calculates a phase difference by dividing a delay time of a period of the pulse blood pressure modulation waveform with respect to a period of the pulse wave blood pressure modulation waveform, by a reference period, with any period defined as a reference period, and creates a frequency distribution for each phase difference value range and a drowsiness value acquisition part that calculates a ratio of a difference with respect to a sum of two frequency values in two value ranges of the frequency distribution of a specific delay time zone, and acquires a drowsiness value.SELECTED DRAWING: Figure 5COPYRIGHT: (C)2018,JPO&INPIT【課題】本発明の課題は、眠気を判定する判定精度を向上させることを目的とする。【解決手段】上記課題は、被験者の脈波信号を受信すると、受信した該脈波信号を解析して、脈波の振幅から血圧の変調を表わす脈波血圧変調波形を算出する振幅解析部と、前記脈波を解析して、該脈波の脈拍間隔から血圧の変調を表わす脈拍血圧変調波形とを算出する脈波解析部と、前記脈波血圧変調波形の周期に対する前記脈拍血圧変調波形の周期の遅延時間を、いずれかの周期を基準周期として該基準周期で除算することで、位相差を算出し、該位相差の値範囲ごとの頻度分布を作成する頻度分布作成部と、特定の遅延時間帯の前記頻度分布の2つの値範囲において、2つの頻度値の合計に対する差分の割合を算出して眠気値を取得する眠気値取得部とを有する眠気判定装置により達成される。【選択図】図5
